Samsung patents camera lens system with dual motors for precise focus

1. An electronic device comprising: a housing; a lens assembly comprising at least one lens aligned along an optical axis; and an auto-focus (AF) actuator to move the lens assembly within the housing, wherein the AF actuator comprises: a first AF magnet disposed on a first side of the lens assembly, a second AF magnet disposed on a second side of the lens assembly opposite to the first side, a first AF coil disposed to face the first AF magnet, a first position sensor configured to detect a first position of the first AF magnet, a second AF coil disposed to face the second AF magnet, a second position sensor configured to detect a second position of the second AF magnet, a first AF driver integrated circuit (IC) including first memory configured to store a first calibration value and a first driving circuit configured to control a current applied to the first AF coil based on the first position of the first AF magnet detected via the first position sensor, a second AF driver IC including second memory configured to store a second calibration value and a second driving circuit configured to control a current applied to the second AF coil based on the second position of the second AF magnet detected via the second position sensor to move the lens assembly in a direction of the optical axis, the second memory being separate from the first memory, wherein the first driving circuit and the second driving circuit are configured to allow opposite ends of the AF actuator to have substantially a same stroke, wherein the current applied to the second AF coil is different from the current applied to the first AF coil, wherein the first AF driver IC is disposed inside a periphery of the first AF coil and configured to control the first driving circuit based on the first calibration value stored in the first memory, and wherein the second AF driver IC is disposed inside a periphery of the second AF coil and configured to control the second driving circuit based on the second calibration value stored in the second memory.